On December 19, 2011, Microsoft released SQL Server 2008 R2 RTM Cumulative Update 11 (CU11), which is Build 10.50.1807.0. I count 22 fixes in this Cumulative Update. This CU is only for the SQL Server 2008 R2 RTM branch, so it will not work if you have already installed SQL Server 2008 R2 Service Pack 1 (Build 2500) or later. It also will not work if you are running any build of SQL Server 2008, which is an earlier major version of SQL Server. If you are still on the RTM branch of SQL Server 2008 R2, you should be pushing your organization to get on the SP1 branch. This is for two main reasons. First, Microsoft added a number of useful DMVs in SQL Server 2008 R2 Service Pack 1 that make it a little easier to manage your database servers. Second, we are getting ever closer to the point where Microsoft will retire the RTM branch of SQL Server 2008 R2. If that happens, and you are still on the RTM branch, you will only get limited support if you ever need to open a support case with Microsoft Support. Don’t let that happen to you!